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C3.1.4—Brain as information integration organ

Brain as information integration organ links named stimuli, coordinating structures and effectors so body systems or plant tissues produce an integrated biological response.

Syllabus
First assessment 2025
Objective
C3.1.4
Level
HL

Exam analysis

Chance of appearing7%of analysed past papers
Latest appearanceMay 2024
Most common paperPaper3
Typical marks1–2

Common command terms

  • Explain
  • Outline
  • Identify
  • Label
  • State
  • Discuss
  • Determine
  • Compare
  • Contrast

Scoring notes

Common mistake
Naming a brain region without linking it to information integration or coordination.

Recent exam appearances

May 2024Paper3 ["HL"] · TZ25(b)[ 2 ]C3.1.4—Brain as information integration organ
November 2023Paper3 ["HL"] · TZ25(a)[ 1 ]C3.1.4—Brain as information integration organ
May 2019Paper3 ["HL"] · TZ24(b)(ii)[ 1 ]C3.1.4—Brain as information integration organ
May 2017Paper3 ["HL"] · TZ28[ 6 ]C3.1.4—Brain as information integration organ
May 2014Paper3 ["HL"] · TZ26[ 6 ]C3.1.4—Brain as information integration organ
Practice this objective

Coverage 2012–2024 · Updated 16 Jul 2026

Concept essentials

  • Brain as information integration organ depends on linking the stimulus to the coordinating structure or signal.
  • The pathway for brain as information integration organ must keep information flow and response direction clear.
  • Named tissues, hormones, neurons or effectors give brain as information integration organ its biological specificity.
  • Evidence about brain as information integration organ is strongest when structure, mechanism and outcome are connected.
ConceptIB Biology HL